TL;DR Ex has moved on and I'm still a WIP

So, it has almost been a year since my breakup. Relationship lasted 8 years from 21 - 29. Ex and I talked for a few months after, but it ended up being too painful for me.

Found out the other day that ex has moved in with someone new. They would have only been dating for 6 months or less. I know it has nothing to do with me, but I feel a little defeated by it. I'm not jealous of him being with her, I don't wish it was me, but I am jealous that he has moved on. I still feel like a tangled mess of conflicting emotions. I guess wanted him to do better and be focused on himself but I guess it was always just me who was the problem.